Left to right: Negativchik, pozitivchik and yifflivchik.

After sketching, I decided to make some kind of analogy with all known apes, so the three of them put together on one sheet.

Negativchik feeds by negative emotions. Now most pleased.
Pozitivchik feeds respectively positive emotions. Now he lives hand to mouth - and therefore with outstretched arms.
If long time did not feed the of such spirit, they hibernate, so yifflivchik asleep. It feeds erotic feelings and intimacy.

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Used machine translation.